KR20120042952A - Filtration cloth for dust collection machine - Google Patents

Abstract

According to the present invention, there is provided a filter cloth for dust collector that can withstand low pressure loss, no clogging and continuous use excellent in dust collection performance even under high-speed filtration and dust collection conditions of high dust concentration. The filter cloth for dust collector which concerns on this invention is a filter cloth which laminated | stacked and integrated the filtration layer of the nonwoven fabric layer containing thermoplastic fiber, and the support layer of a woven fabric layer, The height from the top part to the valley part of at least the filtration surface layer of the said laminated body integrated layer is 1.6. It is characterized by having an uneven shape of mm? 20.0mm.

Description

Filter cloth for dust collector {FILTRATION CLOTH FOR DUST COLLECTION MACHINE}

The present invention relates to a filter cloth for dust collector. More specifically, the present invention relates to a filter bag for dust collectors that exhibits excellent filtration performance even under the severe use conditions of high dust concentration and high speed filtration.

In general, the dust collector forms a powder layer by first depositing the powder to be collected in a cylindrical filter bag sewn into a cylindrical and envelope shape to the surface layer of the filter cloth to prevent the intrusion of the powder into the interior to collect the powder on the powder of the primary layer. The operation of pulsing the collected powder by pulsating the filter cloth main body by reversely rotating the internal and external pressure in the filter cloth is repeated. Therefore, the performance of the dust collector is governed by how to properly balance the collection and dusting.

Therefore, it is desired that these filter cloths have a low pressure loss (hereinafter referred to as a low pressure loss), high collection efficiency, no clogging, and excellent in brittleness. Thus, various filter cloth proposals have been made so far. The lamination structure of fine fibers on the surface (see Patent Documents 1 to 3 below) or a method of arranging a film such as a PTFE resin or a porous membrane on the surface layer (surface) mainly (see Patent Document 4 below) has the above effect. It is described as high. However, depending on the molding of the target powder, the adhesion layer of the powder forms a dense structure and the air permeation resistance is increased, so that it is not necessarily excellent in terms of function.

Moreover, the means which increases the filtration area of a filter cloth is also employ | adopted for high speed filtration of a dust collector and low pressure loss. For example, methods such as pleat processing are known (see Patent Documents 5 and 6 below), but the valleys of the pleats have a significant accumulation of dust collection, and the entire filter cloth does not have a function as an effective filtration area, and thus is used for bug filters. It cannot be said that the filtration area is increased in a shape that can withstand continuous use. Moreover, although the following patent document 7 states that the outstanding air permeability can be obtained by the uneven | corrugated sheet | seat made from the nonwoven fabric which has an uneven | corrugated shape, development to bug filter use was inadequate in the point of strength.

Patent Document 1: Japanese Patent No. 3722259 Patent Document 2: Japanese Patent Application Laid-open No. Hei 7-96089 Patent Document 3: Japanese Patent Application Laid-Open No. 9-187611 Patent Document 4: Japanese Patent No. 3793130 Patent Document 5: Japanese Patent No. 4110628 Patent Document 6: Japanese Patent No. 4023042 Patent Document 7: Japanese Patent Application Laid-Open No. 2001-48238

The problem to be solved by the present invention is to provide a filter bag for dust collectors that can withstand continuous use without high pressure loss and no clogging, even under high-speed filtration and dust collection conditions of high dust concentration, and excellent in brittleness. . In addition, the problem to be solved by the present invention, without limiting the size of the dust collector is used a bug filter, there is no dust clogging to provide a dust filter filter bag having a low pressure loss and long life filter performance is good dust removal Do too.

MEANS TO SOLVE THE PROBLEM As a result of earnestly examining and experimenting in order to solve the said subject, as a result, the uneven | corrugated shape was made to the target powder at least the filter surface layer of the laminated body which laminated | stacked and integrated the filtration layer of the nonwoven fabric layer containing thermoplastic fiber, and the support layer of a fabric layer. The present invention has been accomplished by discovering that the above problems can be solved by depositing on a filter cloth.

That is, this invention is as follows.

[1] A filter cloth in which a filtration layer of a nonwoven fabric layer comprising thermoplastic fibers and a support layer of a woven fabric layer are integrally laminated, wherein at least a filtration surface layer of the laminated integral filter cloth is 1.6 mm to 20.0 mm in height from a peak to a valley. Dust collecting filter cloth characterized in that it has a.

[2] The filter cloth for dust collecting according to the above [1], wherein the number per unit area of any one of the concave, convex and concave and convex portions is 10 to 5000/100 cm ² .

[3] The filter cloth for dust collector according to the above [1] or [2], wherein the filtration surface layer has irregularities of different densities.

[4] The filter cloth for dust collector according to any one of [1] to [3], in which a fusion portion and a non-fusion portion, which are fused to the filtration surface layer, are mixed.

[5] The filter cloth for dust collector according to any one of [1] to [4], wherein a resin binder is provided to the filter cloth.

[6] The filter cloth for dust collector according to any one of [1] to [5], wherein the air permeability of the filter cloth is 1 to 100 cc / cm ² / sec.

[7] The filter layer of the nonwoven fabric layer [1] ?, wherein the filter layer comprises any one of a short fiber nonwoven fabric, a long fiber nonwoven fabric, and a fibrous web having a fiber diameter of 0.1 to 100 µm and a unit weight of 100 to 900 g / m ² . 6] The filter cloth for dust collector as described in any one of them.

[8] The filter cloth for dust collector according to any one of [1] to [7], wherein the support layer of the woven fabric layer is a woven fabric containing any one of multifilament, monofilament, or yarn.

[9] The filter cloth for dust collector as described in any one of [1] to [8], wherein the thermoplastic fiber of the filter layer is formed by laminating or blending polyester fibers having a birefringence of 0.06 or less.

[10] The filter cloth for dust collector according to any one of [1] to [8], wherein the thermoplastic fiber of the filter layer is formed by laminating or blending polyphenylene sulfide fibers having a birefringence of 0.08 or less.

The filter cloth for dust collectors according to the present invention has a low pressure loss and good long life filter performance without impairing dust collection and preventing dust collection even under high speed filtration and high dust concentration conditions. The filter can be widely used in various dust collectors without limiting the size of the dust collector used. The dust collector using the bug filter has an excellent collection efficiency of fine particles, but has a drawback of high power consumption due to the large pressure loss compared to other methods (electric dust collector, cyclone and others), but the filter by using the filter bag for dust collector of the present invention Low pressure loss and energy saving can be expected.

1 is a schematic plan view of the surface of the filter cloth (concave-convex: rectangular).
2 is a schematic cross-sectional view (between ab and cd in FIG. 1) of the filter cloth.
FIG. 3 is an electric field photograph replacing the figure showing the state of the dense part on the surface of the filter cloth. FIG.
4 is a photograph of the electric field replacing the drawing showing the state of the sparsity of the surface of the filter cloth.
5 is a graph showing the spacing intervals and the number of times of tearing in Examples 1 to 7 and Comparative Examples 1 to 4;
FIG. 6 is a graph showing the residual pressure loss and the number of times of removal of the filter cloth after dust removal in Examples 1 to 7 and Comparative Examples 1 to 4. FIG.

Hereinafter, the present invention will be described in detail.

The present invention is a filter cloth for a dust collector in which a filtration layer of a nonwoven fabric layer containing thermoplastic fibers and a support layer of a woven fabric layer are integrally laminated, wherein at least the filtration surface layer of the laminated integral layer has a height from the peak to the valley (the height of the uneven portion). It is said filter cloth which has an uneven | corrugated shape of 1.6 mm-20.0 mm, and it functions as a dust collector filter cloth with low pressure loss and long life filter performance by which such a structure is no dust clogging and favorable dust-bleaching property.

In the filter cloth of the present invention, the role of the concave-convex shape having a height difference of 1.6 mm or more of the surface layer of the filter cloth is to improve the performance of the filter cloth by increasing the filtration area by making the surface of the filter cloth concave and convex by utilizing the formation of the thermoplastic fiber. It is to provide low pressure loss, high speed filtration and high collection properties. The increase in the filtration area, that is, the surface area ratio before and after the uneven processing (area after the uneven processing / before the uneven processing) is preferably 1.1 to 4.0, more preferably 1.1 to 3.2.

The filter cloth of the present invention preferably has an uneven shape in which at least the filtration surface layer of the laminate integrally laminated has different densities. This unevenness causes unevenness in the entry angle of the dust, and the dust layer is loosely formed. Further, by providing a dense difference in the embossed concave and convex surfaces, the powder collected by the dust collection is thick in the concave portion and thinly deposited in the convex portion. Therefore, especially when the powder is blown off by the pulse jet method, the deposited layer is easily collapsed and the shaking effect is high. Furthermore, the difference in airflow resistance caused by the concave bottom surface, the convex apex and the convex side connecting them, and the fiber density difference of each increases the effect of forming the deposited layer without hardening the powder collected in the filter cloth. As a result, there is less clogging, less air resistance, and lower pressure loss of the whole filter cloth than the filter cloth having a smooth surface.

Further, in the step before the uneven processing, the filtration surface layer is formed to mix the fused and non-fused portions by melting, heating rolls, indirect heating by an infrared heater, or the like, thereby suppressing clogging of the filter cloth and causing the slidability. This is improved. The range of the molten fusion | melting part which occupies for a filtration area layer is 3%-80%, Preferably it is 10%-60%. When the fusion | melting part is less than 3%, dust slack property falls, On the other hand, when the fusion | melting part exceeds 80%, the peeling effect is excellent but a pressure loss becomes large.

The height (hereinafter also referred to as the height of the uneven portion) of the convex portion of the convex portion of the filter cloth surface layer of the present invention (hereinafter also referred to as the height of the uneven portion) is 3 (FIG. 2 in FIG. 2 of the laminate molded by the uneven roll. The height difference E from the highest point A of the surface shown by the layer surface) to the lowest point B in FIG.

In the present invention, the height from the peak to the valley of the uneven portion needs to satisfy 1.6 mm to 20.0 mm. That is, when the height from the peak to the valleys of the uneven portion is less than 1.6 mm, the effect of dusting is low as the filter function of the powder has a smooth surface, while the height from the peak to the valley of the uneven portion exceeds 20.0 mm. When mounted on the dust collector, problems such as deterioration of wear resistance due to contact with the retainer, rapid deterioration such as perforation, and poor workability when sewing in the form of a cylinder are deteriorated. Is 2.0 mm to 16.0 mm, more preferably 2.0 mm to 12.0 mm.

 However, when laminating and unifying by needle punching, the uneven shape expressed on the filtration surface layer caused by the array pattern of the needle needles is not called the uneven shape of the present invention.

In addition, it is preferable that the filter which has what is called a pleat-shaped shape is not included.

The concave-convex shape of the filter cloth surface layer of the present invention is a concave-convex imparting device (see Japanese Patent No. 3939985) by a pair of concave-convex rollers, a pair of metal engraving rolls, a combination of a metal engraving roll and a paper roll on one side, and the like. The cross-sectional shape which processed the uneven | corrugated shaping | molding using the embossing apparatus, the flat plate press apparatus by a metal engraving plate, the cylindrical press apparatus which has an uneven | corrugated shape, etc. is said. Representative wave shapes are shown in FIG. 2. In addition, there are continuous, such as gears and lattice, or concave portions such as hemispherical and polygonal, discontinuously arranged in a zigzag, and at regular intervals. The uneven shape is not particularly limited, and it is preferable to increase the filter cloth surface area with respect to the plane. Examples of the shape that is shaped on the surface of the filter cloth surface include squares, circles, ellipses, diamonds, and the like, in addition to the rectangles shown in FIG. 1, but are not limited thereto.

In the present invention, the number per unit area of any of the concave portion, the convex portion, and the uneven portion is 10 to 5000/100 cm ² , and more preferably 50 to 1500/100 cm ² .

Next, an example of the filter cloth surface state diagram of this invention is shown in FIG. FIG. 3 is a state diagram in which part 1 of the planar and cross-sectional schematic views of the surface of the filter cloth shown in FIGS. 1 and 2 are taken by an electron microscope, and FIG. 4 is a state diagram in which part 2 in the drawings is observed by an electron microscope. . 5 is a fusion portion in which the filtration surface layer is melted by a heating roll in a step before the uneven processing, and 6 in the figure is a dense portion in which fibers of the surface layer of the laminate are pressed and crushed by the uneven roll to closely adhere the fibers. In FIG. 7, the fibers of the surface layer of the laminate are pushed out by the uneven rolls, the fibers are stretched, and the coarse portions where the fiber gaps are widened. As is apparent from Figs. 3 and 4, the fusion | melting fusion | melting part, the pressed dense part, and the extended coarse part are mixed in the filter cloth surface layer. It can be confirmed by observation with these electron microscopes that a filtration surface layer has the uneven shape which differs at least densely, and the melted fusion | melting part and a non-fusion part mix. Moreover, when there are many fusion | melting parts in a recessed part, clogging to the inside of dust in a recessed part is suppressed, and it is preferable.

The thermoplastic fibers used in the present invention are preferably synthetic fibers or recycled fibers, most preferably thermoplastic synthetic long fibers. As a raw material resin of the thermoplastic synthetic long fiber, a synthetic resin which can be fibrous is used. For example, polyolefins, such as polyolefins, such as a polypropylene, an ethylene propylene copolymer, and an ethylene-vinyl acetate copolymer, polyethylene terephthalate, a polybutylene terephthalate, a polytrimethylene terephthalate, a polyethylene terephthalate, phthalic acid, isophthalic acid, Aromatic polyester copolymers copolymerizing one or two or more compounds of sebacic acid, adipic acid, diethylene glycol, 1,4-butanediol, polylactic acid polymers, poly D-lactic acid, poly L-lactic acid, D- Copolymers of lactic acid and L-lactic acid, copolymers of D-lactic acid and hydroxycarboxylic acids, copolymers of L-lactic acid and hydroxycarboxylic acids, copolymers of D-lactic acid and L-lactic acid and hydroxycarboxylic acids Polyesters such as aliphatic esters such as copolymers, polyamides such as nylon 6, nylon 66, and copolymerized polyamides, and sheaths are poly Ethylene, polypropylene, copolymer esters, polypropylene, poly terephthalate, complexes such as polyethylene terephthalate, polyphenylene sulfide, meta aramid, polytetrafluoroethylene, polyimide, acrylic, polyoxymethylene, polyether ether ketone, liquid crystal Polymers, polymethylpentene, polyvinyl alcohol, polyvinylidene chloride and the like are used.

These thermoplastic resins may be used alone or in combination of two or more as a polymer alloy. Moreover, you may use bicomponent fiber, such as a core-sheath structure and a side by side structure which combined 2 or more types of different resin.

A polyester polymer having excellent dimensional stability is preferably used for a general bug filter filter cloth, and a polyphenylene sulfide, meta-aramid, polyimide, and polytetra is excellent in heat resistance and rigidity because of its high melting point. Fluoroethylene is preferably used.

In addition, a nucleating agent, a matting agent, a pigment, an antifungal agent, an antibacterial agent, a flame retardant, a water repellent, and the like may be added to the synthetic fiber within a range that does not impair the effects of the present invention.

Although the cross-sectional shape of the said thermoplastic fiber is not specifically limited, Preferably, it is a form, such as circular, a hollow annular shape, elliptical shape, flat form, X-type, Y-type, and mold release shape, a polygon, a multileaf shape, etc.

The nonwoven fabric layer of the filtration layer used for the filter cloth of the present invention refers to short fibers and sheets obtained by a known carding method, spun bond method, airlay method, thermal bond method, melt blown method, etc., using the above-mentioned thermoplastic resin as a raw material. Refers to fiber nonwovens and fiber webs. The structure of a filter layer has the combination of single and mixed fiber.

The structure of the filter cloth of this invention is a basic structure which laminated | stacks the said nonwoven fabric layer and the said support layer. Specifically, it is a three-layered structure including the nonwoven fabric layer above and below, a support layer in the middle, or a two-layer structure including the above nonwoven fabric layer and a support layer below.

Moreover, 0.1-100 micrometers is preferable, as for the fiber diameter of the fiber used for a nonwoven fabric layer, 1-50 micrometers is more preferable, It selects according to the kind of dust (dust) to collect. A weight per unit area of the nonwoven fabric layer of the filtering layer is ^{100g / m 2? 900g / m} 2 are preferred, and more preferably from ^{200g / m 2? 700g / m} 2.

Moreover, in order to improve the uneven | corrugated shaping | molding of a filtration layer, it is preferable to use the nonwoven fabric layer containing polyester fiber of birefringence 0.06 or less, More preferably, it is 0.003-0.05, More preferably, it is 0.03-0.05. If the birefringence is within this range, the elongation of the fiber is large, and the filter cloth is excellent in good shaping and uneven shape retention. In addition, the said nonwoven fabric can also be used in combination by mixing, laminating | stacking, etc. of other materials, A combination and a kind are not specifically limited.

Moreover, it is preferable to use the nonwoven fabric layer which contains the polyphenylene sulfide fiber of birefringence 0.08 or less for the filter cloth used for the dust collector for high temperature gas filtration, More preferably, it is 0.03-0.06. If the birefringence is within this range, the elongation of the fiber is large, resulting in a filter cloth excellent in good buoyancy and uneven shape retention, and can maintain the initial uneven shape even when exposed to a high temperature gas for a long time in actual use, and have good collection performance over a long period of time. It can maintain dust and dust.

In addition, for the purpose of improving the heat resistance of the surface layer, it is possible to combine lamination, compounding, and the like such that the heat resistant fiber is composed of the surface layer, and the subsequent layer is made of the heat resistant fiber lower than the surface layer.

The support layer of the woven fabric layer used for the filter cloth of this invention is used for the purpose of dimensional stability improvement, such as reinforcement of strength and prevention of elongation of a filter cloth. Therefore, what is necessary is just to use the woven fabric containing the multifilament, monofilament, and spun yarn of the thermoplastic resin used for the said nonwoven fabric as a raw material. The unit weight does not impair the air permeability of the filter cloth, and the shortage of strength as the filter cloth should not occur, and 50 to 250 g / m ² is preferable, and more preferably 60 to 200 g / m ² .

Although the method of laminating and integrating the filtration layer and the support layer of this invention is not specifically limited, For example, the needle punch method or the water punch method is preferable. In addition, it is also possible to carry out compounding with a laminate or an adhesive binder if the strength and filter characteristics of the filter cloth are not impaired.

As for the temperature of the uneven | corrugated roll which is a condition of the uneven | corrugated shaping | molding method of this invention, the temperature of the range of 5-60 degreeC lower than the glass transition point (Tg)-melting point of the fiber of the nonwoven fabric layer of a filter cloth surface layer is preferable.

In addition, in the case where the uneven shape retention is insufficient, the fibers of at least the surface layer of the laminate before and after the uneven processing are, for example, acrylic resins, polyurethane resins, vinyl acetate resins, ethylene vinyl acetate resins, polyvinyl alcohols, and various rubber types. Thermoplastic and thermosetting resin binders typified by latex, phenol resins and epoxy resins can be sprayed by resin impregnation and spraying. The adhesion amount of resin should just be a grade which does not impair filter performance, and 0.5-10% of the unit weight amount of a filter cloth is preferable.

In addition, within the range of not impairing the effects of the present invention, a resin, such as a pigment, an antifungal agent, an antibacterial agent, a flame retardant, a water repellent, an oil-repellent agent, or a chemical-resistant agent for the purpose of improving chemical resistance, or by processing in a separate process is added to these resins. It can also impart the function of the formulation.

Air permeability of the filter cloth of the present invention, part 1 is preferably the 100cc / cm ² / sec, more preferably ^{5? 80cc / cm 2 / sec} , more preferably ^{10? 50cc / cm 2 / sec} . If it is less than 1 cc / cm ² / sec, the initial pressure loss of the filter cloth is not preferable. On the other hand, if it exceeds 100 cc / cm ² / sec. This is undesirable because it occurs.

0.5-8.0 mm is preferable and, as for the thickness (henceforth simply "thickness of a filter cloth") of the filter cloth which has an uneven | corrugated shape after the uneven | corrugated processing of this invention, 1.5-6.0 mm is more preferable. Moreover, 1.0-9.0 mm is preferable and, as for the thickness of the filter cloth before uneven | corrugated processing, 1.0-8.0 mm is more preferable.

Next, preferable embodiment of a series of manufacturing process of the three-layer laminated integrated filter cloth of the uneven | corrugated shape of this invention is demonstrated.

In the first step, a short fiber comprising a thermoplastic fiber is obtained by a known carding method (commonly used carding conditions), and a multifilament, monofilament, and spun yarn comprising the same thermoplastic fiber in the back layer and the middle layer. A long-fiber nonwoven fabric obtained by a known spunbond method having excellent uneven buoyancy including a support layer and the same thermoplastic fiber is laminated on a surface layer, and then a known needle punch processing method (usually a general needle punch) Condition) A three-layer laminate is obtained by preliminary punching from the surface layer to the back layer, and punching viewed from the back layer to the surface layer, and from the surface layer to the back layer.

The 2nd and 3rd process performs a calendering process on the surface layer side, and calendering process with a pair of smooth metal rolls (heating and gap).

 Subsequently, in the fourth step, the concave-convex shape is performed by a pair of wavy convex rollers having a concave-convex shape under a temperature in a range of 5 to 60 ° C. lower than the melting point of the thermoplastic fiber by the concave-convex imparting device. A three-layer laminated filter cloth can be obtained.

 Moreover, after performing uneven | corrugated shaping | molding of a 4th process, it can also cool and raise rigidity of a fiber.

Example

Hereinafter, although an Example and a comparative example demonstrate this invention concretely, this invention is not restrict | limited by these examples.

In addition, the measuring method and the evaluation method were as follows.

(1) the height from the ridge to the valley (mm) (or the height of the unevenness (mm))

The cross section was randomly extracted from the uneven | corrugated filter cloth (1m <^2> ), the cross section was observed with the microscope, the height from the uneven | corrugated peak part to the valley part was measured, and the average value of the 10 places was calculated | required.

(2) Number per unit area of any one of concave, convex and concave and convex portions (pcs / 100cm ² )

Three test pieces of 10 cm in diameter and 10 cm in diameter were sampled per 1 m of the width of the sample, and the number of any one of the concave portion, the convex portion, and the uneven portion was measured and the average value was obtained.

(3) Breathability (cc / cm ² / sec)

According to the method specified in JIS-L1906, three test pieces having a diameter of 15 cm x 15 cm were sampled per 1 m of the width of the sample, and the amount of air passing through the test piece was measured by the framing method, and the average value was obtained.

(4) unit weight (g / m ² )

According to the method specified in JIS-L1906, three test pieces of diameter 20 cm x 25 cm were sampled per 1 m width of the sample, the mass was measured, and the average value was calculated by converting the mass per unit area.

(5) thickness (mm)

In the same manner as the measurement of the height from the peak portion to the valley portion in the above (1), the cross section was observed under a microscope to measure the thickness of the convex portion, and the average value of the ten portions was obtained.

(6) fiber diameter (μm)

The test piece of 1 square cm was cut out from the area | region every 20 cm in width of the filter cloth, and it was set as the sample. About each test piece, the diameter of the fiber was measured 30 points by the microscope, the average value of the said measured value was computed, and it was set as the fiber diameter.

(7) birefringence

The birefringence of the fiber was measured from the retardation and the fiber diameter by a polarization microscope (Olympus Co., Ltd.) equipped with a Berek compensator. Olive oil was used for the immersion liquid and tricredil phosphate was used for the polyphenylene sulfide fiber. It measured about 10 points of fibers of a sample, and represented by the average value of 10 points.

(8) not clogged well

Filtration performance was based on JIS-Z8909-1. It was hard to be clogged from the measurement result by the following measurement conditions, and the peelability was judged.

(Measuring conditions)

Filtration speed: 2.0mm / min,

Dust concentration: 5 g / m ³ ,

Dust type: 10 kinds of test powder (fly ash),

Dust Whisk: 1000Pa,

Aging interval: 5s,

Tank pressure: 0.5 MPa.

(9) Thickness of filter cloth before uneven processing

According to the method of JIS-L1906, ten places were measured in the width direction by the contact load of 2 kPa, and the average value was made into thickness. PEACOCK company was used as thickness measuring machine.

(order)

(1) In the step of mounting the sample, the initial pressure loss Pa (hereinafter also referred to as pressure loss) of the sample felt is measured without dust.

(2) First step: When the pressure loss reaches 1000 Pa, turn off the dust. This operation is repeated 30 times. The residual pressure loss (Pa) and the exhaust concentration (mg / m ³ ) immediately after the turn at that time are measured.

(3) Second step: The aging treatment is repeated 5000 times at 5s intervals.

(4) Third step: The dust removing operation at the pressure loss 1000 Pa was performed ten times as a stabilization operation.

(5) 4th step: Dust debris in the pressure loss 1000Pa is performed 30 times. The residual pressure loss Pa at that time and the exhaust concentration (mg / m ³ ) were measured.

[Not blocked]

Using the test result of the fourth step, from the relationship between the number of times and the spacing interval, the longer the spacing interval, the better the clogging property.

[Spillability]

Using the test result of the fourth step, the lower the residual pressure loss from the relationship between the number of times of whistle and the residual pressure loss, the better the brittleness.

Example 1

In the filtration layer of the filter cloth, a long-fiber nonwoven fabric having a unit weight of 230 g / m ² composed of polyethylene terephthalate fibers having a birefringence of 0.04 and an average fiber diameter of 17.6 μm by a known spun bond method, and a single yarn number 10 × 1 strand twisted to a support layer. A polyethylene having a birefringence of 0.13, an average fiber diameter of 14.3 μm, a cut length of 51 mm, and five crimps / inch of polyethylene and terephthalate fibers in a woven fabric having a unit weight of 70 g / m ² with a plain weave, and a back filter layer. The terephthalate short fiber web unit weight 200g / m <^2> was laminated | stacked, and the laminated body integrally laminated by needle punching was obtained. Subsequently, the laminated body was heat-set (temperature x time; 180 degreeC x 30 second), and air permeation control was performed by hair-burning and a pair of smooth metal rolls (temperature 80 degreeC). The unevenness | corrugation provision apparatus by a pair of uneven | corrugated roller of thickness 3mm of the concavo-convex circular plate used for a roller, the height from the peak part to the valley part of a concave-convex part to a pitch (vertical direction) 15mm, and a thickness of spacer 15mm (Embossa TM, manufactured by Saito Engineers Co., Ltd.), was processed under conditions of a roll gap of 0.5 mm, a temperature of 150 ° C., and a processing speed of 1.2 m / min. A filter cloth having a convex portion of 117/100 cm ² per unit area on the surface was obtained. The result of having measured the characteristic and filtration performance of the filter cloth obtained in the following Table 1 was shown.

[Example 2]

The birefringence 0.13, the average fiber diameter of 14.3 μm, the cut length of 51 mm, the five crimps / inch, the unit weight of 210 g / m ² , and the single-layer web number of single yarns to the support layer by the known card method in the upper and lower filtration layers of the filter cloth. A laminated body was laminated by needle punching by laminating a woven fabric having a unit weight of g / m ² with a spun yarn of 20 times x 2 strands and 16 strands / inch of polyethylene terephthalate fiber on a light 18 strands / inch. . Subsequently, ventilation control was performed by heat setting (temperature X time is 200 degreeC x 30 second), hair burning, and a pair of smooth metal rolls of a laminated body. This laminate was placed on one side by a embossing device in combination with a diamond-shaped uneven piece pattern having a height of 2.0 mm and a vertical × horizontal pitch of 6.0 mm × 5.0 mm and a paper roll. A filter cloth having a height of 2.0 mm up to the valleys and 1368/100 cm ² uneven portions per unit area on the filtration surface was obtained. The result of having measured the characteristic and filtration performance of the filter cloth obtained in the following Table 1 was shown.

Example 3

The roll gap was 0.5 mm and the temperature was 150 using a pair of uneven rolls having the same structure and the same processing as in Example 1, the height of the valleys from the roll peaks to the valleys being 16 mm and the pitch (vertical direction) of 24 mm between the peaks. Processing was performed under the condition of ° C to obtain a filter cloth having a convex portion of 72/100 cm ² per unit area on the height of 16 mm and the filtration surface. The result of having measured the characteristic and filtration performance of the filter cloth obtained in the following Table 1 was shown.

Example 4

In the filter layer of the filter cloth, a long-fiber nonwoven fabric having a unit weight of 200 g / m ² composed of polyphenylene sulfide fibers having a birefringence of 0.04 and an average fiber diameter of 14.5 μm by a known spun bond method, and a support layer of 225 denier and 60 filament polyphenyls. Unit weight 200 g / consisting of a woven fabric having a unit weight of 100 g / m ^{2 made} of renulfide multifilament fibers and a polyphenylene sulfide short fiber web having an average fiber diameter of 14.5 μm and a cut length of 51 mm by a known card method on the back side. laminating a ² m to obtain a laminated body integrally laminated by needle punching. Subsequently, ventilation control was performed by heat calendering, hair-taking, and a pair of smooth metal rolls by a 230 degreeC pair of smooth metal rolls. The unevenness | corrugation provision apparatus by a pair of uneven | corrugated roller of thickness 3mm of the concavo-convex circular plate used for a roller, the height from the peak part to the valley part of a concave-convex part to a pitch (vertical direction) 15mm, and a thickness of spacer 15mm (EmbossaTM, manufactured by Saito Engineers Co., Ltd.), was processed under the conditions of 0.5 mm roll gap, 220 ° C temperature, and 1.2 m / min processing speed. A filter cloth having 96/100/100 cm ² convex portions per unit area was obtained. The result of having measured the characteristic and filtration performance of the filter cloth obtained in the following Table 1 was shown.

[Example 5]

In the laminated body which performed the same structure and the same process as Example 4, using a pair of uneven | corrugated roll whose height from a peak part of a convex part to a valley part is 20 mm, and a pitch (vertical direction) between shatters is 0.5 mm, temperature is 0.5 mm, It processed at 220 degreeC, and obtained the filter cloth which has a height of 20 mm from the peak part of the uneven part to the valley part, and the convex part of 80/100 cm <^2> per unit area in a filtration surface.

Subsequently, the epoxy resin of the adhesion amount 10g / m <^2> was given by the spray method, and drying and heat setting (180 degreeC * 3 minutes) were performed, and the filter cloth of height 20.0mm of unevenness | corrugation was obtained. The result of having measured the characteristic and filtration performance of the filter cloth obtained in the following Table 1 was shown.

[Example 6]

In the filtration layer of the filter cloth, a long-fiber nonwoven fabric having a unit weight of 200 g / m ² and a support layer of 225 deniers and 20 strands / inch by birefringence 0.08 and polyphenylene sulfide fibers having an average fiber diameter of 11.5 μm by a known spunbond method. , Polyphenylenesulfide multi-filament fibers of 18 strands / inch above the woven fabric of a unit weight of 78 g / m ² of the plain weave and the back filtration layer by a known card method, the average fiber diameter of 14.5μm, cut length 51mm polyphenyl The unit weight 200g / m <^2> which consists of a renulfide short fiber web was laminated | stacked, and the laminated body integrated with lamination by needle punching was obtained. Subsequently, the laminated body was subjected to thermal calendering treatment, hair burning and aeration control with a pair of smooth metal rolls (temperature 210 ° C.) with a pair of smooth metal rolls at 200 ° C. The unevenness | corrugation provision apparatus by a pair of uneven | corrugated roller of thickness 3mm of the concavo-convex circular plate used for a roller, the height of a valley part from a peak part of a concave-convex part to a pitch (vertical direction) of 15mm, and a thickness of 15 mm between spacers (Embossa TM, manufactured by Saito Engineers Co., Ltd.), processing was carried out under conditions of a roll gap of 0.5 mm, a temperature of 240 ° C., and a machining speed of 1.2 m / min. A filter cloth having 96/100/100 cm ² convex portions was obtained. The result of having measured the characteristic of the filter cloth obtained in the following Table 1, and the filtration performance at 190 degreeC which assumed normal temperature and actual use environment was shown.

Example 7

In Example 6, the same method as in Example 6 was used, except that a long bilayer nonwoven fabric having a unit weight of 200 g / m ² composed of polyphenylene sulfide fibers having a birefringence of 0.04 and an average fiber diameter of 14.5 μm was used as the filter layer of the filter cloth. A filter cloth was obtained. The result of having measured the filtration performance at 190 degreeC which assumed the characteristic of the filter cloth obtained in the following Table 1, normal temperature, and the actual use environment was shown.

Comparative Example 1

The birefringence 0.13, the average fiber diameter of 14.3 μm, the cut length of 51 mm, the five crimps / inch, the unit weight of 210 g / m ² , and the single-layer web number of single yarns to the support layer by the known card method in the upper and lower filtration layers of the filter cloth. A woven fabric having a unit weight of 80 g / m ² with a spun yarn of 20S × 2 polyethylene terephthalate fiber was laminated to obtain a laminate obtained by laminating and unifying by needle punching. Subsequently, although the ventilation control was performed by the hair-burning and a pair of smooth metal rolls, the uneven processing was performed and the filter cloth was obtained. The result of having measured the characteristic and filtration performance of the filter cloth obtained in the following Table 1 was shown.

Comparative Example 2

Polyethylene terephthalate having a single yarn count of 20 S × 2 in a long fiber nonwoven fabric having a unit weight of 230 g / m ² and a support layer composed of polyethylene birefringence 0.04 and polyethylene terephthalate fibers having an average fiber diameter of 17.6 μm by a known spun bond method in the filter layer of the filter cloth. 70 g / m ² woven fabric with a spun yarn of fiber, and a birefringence of 0.13, an average fiber diameter of 14.3 μm, a cut length of 51 mm, and 5 crimps / inch of polyethylene terephthalate short-fiber web by a known card method The unit weight 200g / m <^2> which consisted of these was laminated | stacked, and the laminated body which laminated | stacked and integrated by needle punching was obtained. Subsequently, ventilation control was performed by heat setting (temperature X time is 180 degreeC x 30 second), hair burning, and a pair of smooth metal rolls of a laminated body. The laminate was placed on one side with a vertical × horizontal pitch of 3.0 mm × 2.5 mm, a height of 1.5 mm using an embossing device with an embossed roll of a combination of a concave-convex piece pattern of a pin point type and a paper roll, and the temperature was 230. Processing was carried out at 占 폚 to obtain a filter cloth having a height of 1.5 mm. The result of having measured the characteristic and filtration performance of the filter cloth obtained in the following Table 1 was shown.

Comparative Example 3

The long fiber nonwoven fabric of unit weight 250 g / m <^2> which gave the normal embossing of 0.6 mm in height which further comprised the birefringence 0.13 and the polyethylene terephthalate fiber of average fiber diameter of 14.3 micrometers by the well-known spun-bonding method was obtained. This is a filter cloth fabricated without laminating the woven fabric layer and performing normal embossing, but without the uneven processing according to the present invention. The result of having measured the characteristic and filtration performance of the filter cloth obtained in the following Table 1 was shown. The filtration performance was insufficient and the strength was weak.

[Comparative Example 4]

Single biphenyl web with a birefringence of 0.11, an average fiber diameter of 14.3 μm, a cut length of 51 mm, 5 crimps / inch and a unit weight of 210 g / m ² and a support layer in the upper and lower filter layers of the filter cloth by a known card method. The laminated body which laminated | stacked and integrated by the needle punching was laminated | stacked the woven fabric of unit weight 80g / m <^2> which made the spun yarn of the number 20S * 2 polyphenylene sulfide fiber the plain weave. Subsequently, although the ventilation control was performed by the hair-burning and a pair of smooth metal rolls, the uneven processing was performed and the filter cloth was obtained. The result of having measured the characteristic and filtration performance of the filter cloth obtained in the following Table 1 was shown. Comparative Example 4 is an example of using a PPS felt instead of the PET felt of Comparative Example 1 as a PPS felt not subjected to uneven processing.

From Table 1, Fig. 5 and Fig. 6, the filter cloth (Examples 1 to 7) having an uneven shape on the surface of the filter cloth has a low pressure loss and is not easily clogged compared to the conventional filter cloth (Comparative Examples 1 to 4). It is obvious to express the characteristic.

Industrial availability

The filter cloth for the dust collector according to the present invention has a low pressure loss and a long life filter performance without impairing dust and preventing dust collection well under high speed filtration and dust collection conditions of high dust concentration. It does not limit the size of the dust collector used, It can use widely in various dust collectors.

One… Concave,
2… Convex,
3 ... Nonwoven layer on the surface of the filter cloth,
3 '… Nonwoven layer on the back of the filter cloth,
4… Support layer of filter cloth,
5... Molten fusion of filter cloth surface,
6 ... Dense part of filter cloth surface,
7 ... Coarse surface of the filter cloth surface,
A… Gynecology,
B… Occupation,
E… Height from the ridge to the valley (the height of the unevenness),
ab… Landscape,
CD… Portrait,

Claims (10)

A filter cloth obtained by laminating and integrating a filtration layer of a nonwoven fabric layer and a support layer of a woven fabric layer comprising thermoplastic fibers, wherein at least the filtration surface layer of the laminated and integrated filter cloth has a concave-convex shape of 1.6 mm to 20.0 mm in height from the peak to the valley. Dust collecting filter cloth characterized in that. The method of claim 1, wherein any one of the number per unit area of 10? Of the concave portion, the convex portion, concave portion 5000 / 100cm ² of dust collection filter fabric. The filter cloth for dust collectors of Claim 1 or 2 in which the said filtration surface layer has uneven | corrugated shape from which density is different. The filter cloth for dust collector as described in any one of Claims 1-3 in which the fusion | melting part melt | dissolved in the said filtration surface layer and a non-fusion part mix. The filter cloth for dust collector as described in any one of Claims 1-4 by which the resin binder is provided to the said filter cloth. The filter cloth for dust collector as described in any one of Claims 1-5 whose air permeability of the said filter cloth is 1-100 cc / cm <^2> / sec. The filtration layer of the said nonwoven fabric layer is a short fiber nonwoven fabric, a long fiber nonwoven fabric, or a fibrous web of Claim 1 thru | or 6 whose fiber diameter is 0.1-100 micrometers, and a unit weight is 100-900 g / m <^2> . Filter cloth for dust collector comprising any one. The filter cloth for dust collector of any one of Claims 1-7 whose support layer of the said woven fabric layer is a woven fabric containing any one of a multifilament, a monofilament, or a spun yarn. The filter cloth for dust collector according to any one of claims 1 to 8, wherein the thermoplastic fibers of the filtration layer are laminated or blended with polyester fibers having a birefringence of 0.06 or less. The filter cloth for dust collector according to any one of claims 1 to 8, wherein the thermoplastic fibers of the filter layer are laminated or mixed with polyphenylene sulfide fibers having a birefringence of 0.08 or less.

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